package com.chang.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.chang.reggie.common.R;
import com.chang.reggie.util.ThreadLocalUtil;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebFilter(filterName = "LoginCheckFilter", urlPatterns = "/*")
@Slf4j
public class LoginCheckFilter implements Filter {

    // 路径匹配器，支持通配符
    private static  final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        // 1.获取本次请求的URI
        String requestURI = request.getRequestURI();
        log.info("拦截到请求：{}", requestURI);
        // 2.判断本次请求是否需要处理
        String[] urls = new String[]{
                "/employee/login",
                "/emplotee/logout",
                "/backend/**",
                "/front/**",
                "/common/**",
                "/user/sendMsg",// 移动端发送短信
                "/user/login"// 移动端登录
        };
        // 3.如果不需要处理，则直接放行
        boolean check = check(urls, requestURI);
        if (check) {
//            log.info("本次请求：{}，不需要处理", requestURI);
            filterChain.doFilter(request, response);
            return;
        }
        // 4-1.判断管理端用户登录状态，如果已登录，则直接放行
        Object employee = request.getSession().getAttribute("employee");
        if (employee != null) {
//            log.info("用户已登录，用户id：{}", employee);
            ThreadLocalUtil.set("employee", employee);
            filterChain.doFilter(request, response);
            return;
        }
        // 4-2.判断用户端用户登录状态
        if (request.getSession().getAttribute("user") != null) {
//            log.info("用户已登录，用户id为：{}", request.getSession().getAttribute("user"));
            Long userId = (Long) request.getSession().getAttribute("user");
            ThreadLocalUtil.set("user", userId);
            filterChain.doFilter(request, response);
            return;
        }

        // 5.如果未登录，则返回未登录结果
        log.info("用户未登录");
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;
    }

    /**
     * 路径匹配，检查本次请求是否需要放行
     *
     * @param urls
     * @param requestURI
     * @return
     */
    private boolean check(String[] urls, String requestURI) {
        for (String url : urls) {
            if (PATH_MATCHER.match(url, requestURI)) {
                return true;
            }
        }
        return false;
    }

}
